Hi Adolfo,
Yes it seems to be the exact problem. Following the link in the comments
(http://ask.libreoffice.org/en/question/1429/libreoffice-3512-menu-
problem/ ) shows a thread i already know.
I also tried the suggestions which are given there.
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You received this bug notification because you
Public bug reported:
In all applications of the Libre Office package the entries of the menu
bar (like "File", "Edit", "Format", etc.) are not visible but clickable.
Even the hotkey characters are underlined.
I tried to fix it by changing the font rendering options in the Libre Office
settings a